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goeval.go
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goeval.go
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package goeval
import (
"bytes"
"encoding/json"
"fmt"
"os"
"cuelang.org/go/cue"
"cuelang.org/go/cue/cuecontext"
)
// MiniEval3J compiles a schema and data and returns compact JSON selected by expr
func MiniEval3J(schema2, data, expr string) (string, error) {
ctx := cuecontext.New()
v2 := ctx.CompileString(schema2)
if err := v2.Err(); err != nil {
return "", err
}
v3 := ctx.CompileString(data, cue.Scope(v2))
if err := v3.Err(); err != nil {
return "", err
}
res := v2.Unify(v3).LookupPath(cue.ParsePath(expr))
if err := res.Err(); err != nil {
return "", err
}
bytes, err := res.MarshalJSON()
if err != nil {
return "", err
}
return string(bytes), nil
}
func TestMiniEval3J() {
schema, _ := ReadString("data/combo.cue")
data, _ := ReadString("data/raw.json")
expr := "#toApp"
res, err := MiniEval3J(schema, data, expr)
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
ppres, _ := Prettyfmt(res)
fmt.Println(ppres)
}
func ReadString(filepath string) (string, error) {
content, err := os.ReadFile(filepath)
if err != nil {
return "", err
}
return string(content), nil
}
func Prettyfmt(input string) (string, error) {
var prettyJSON bytes.Buffer
if err := json.Indent(&prettyJSON, []byte(input), "", "\t"); err != nil {
return "", err
}
return prettyJSON.String(), nil
}